Wireless receiving set



Aug. 3 1926. 1,594,699

w. K. THOMAS vmuwss macmvme sm- Filed Sept 2, 1922- 2 Sheets-Shoot 1 INVENTOR KDYZNW.

M M 674M, 1W

Aug. 3 1926. v v 1,594,699

w; K. THOMAS WIRELESS RECEIVING SET Filed Sept. 12, 1922 2 Sheets-Shut 2 INVENTOR WAZQKM I z M I Patented Aug. 3, 1926.

UNITED STATES 1,594,699 PATENT OFFICE.

WILLIAM K. THOMAS, OF GRAFTON, PENNSYLVANIA, ASSIGNOR T SAMUEL A. A

IICKERING, OF PITTSBURGH, PENNSYLVANIA.

WIRELESS RECEIVING SET.

Application filed September 12,1922. Serial- No. 587,728.

. This invention relates to wireless receiving sets, and more articularly to those sets embodying a plura ity of detecting and amplifying units such as audion bulbs.

' Wireless receiving sets as ordinarily constructed embody from one to seven audion bulbs for the purpose of detecting and am plifying the incoming waves. The first cost of the larger sets limits theiruse to few persons, and smaller sets of from one to three bulbs have found greater popularity, even though their range is considerably more limited.

Many amateurs having such sets have been desirous of adding thereto, but have found this disadvantageous for a number of reasons. Many users of such sets are entirely unfamiliar with the workings thereof and have great difficulty in properly connecting any additional units to increase the capacity of their receiving sets. Again, when equipment has been purchased at different times, it has entailed the use of two or more separate cabinets containing apparatus, and these must be connected by generally unsightly wiring.

This invention provides an original re ceiving unit of any desired size and makes provision for the addition of a further unit or units which merely need to he slid into place. This unit or units is so constructed that it makes the proper electrical connection with the original unit when it is put into place and breaks any connections in the tion of the receiving set as a whole.

F urthcr, if it is desired to operate with the original set only, the removable unit or units may be taken out entire, thereby reestablishing the connections in the original unit to render it once more a complete working set. This feature is highly desirable, since the best results are often to be achieved with only a few bulbs if the incoming waves are from a nearby sending station. The number of bulbs in use can be varied for different sending stations merely by sliding the desired number of units into place.

In the accompanying drawings illustrating the preferred embodiment of my invention Figure 1 is a front elevation of a removable unit for a wireless receiving set; I

Figures 2 and 3 are side and back views, respectively, of the unit shown in Figure l;

original unit which would prevent the opera-- Figure 4 is a schematic drawing of a receiving set adapted to receive an additional unit; and

Figure 5 is a sectional detail of a cabinet adapted to receive an additional unit.

The independent unit illustrated .comprises an audion bulb socket 1 of usual construction and its transformer 2. The socket 1 and the transformer 2 are mounted on a back 3 which is preferably of fiber or other insulating material. At the bottom of theback 3 are projecting terminals 4 which are connected as shown to the primary winding of the transformer 2 and to the plate and filament terminals of the bulb socket 1. The secondary winding of the transformer 2 makes the usual connections with the grid terminal and with'the negative filament terminal of the socket 1.

Referring now to Figure 4,'there is shown a wireless receiving set which comprises the original unit. This set may be of any desired size or hook-up. The set has the usual aerial and ground terminals 5 and 6 and terminals 7, 8, 9, 10 and 11. In the set shown, the six-volt battery is connected across the terminals 7 and 8, the 22-volt battery across the terminals 9 and 10, and the 80-volt battery across the terminals 10 and 11.

' The original unit also has auxiliary terminals 13. The terminals 13 are small sockets adapted to receive the projecting terminals 4. As shown in F i ure 4, the terminals 13 are on wires branched from the original hook-up, and as long as the removable unit is not in place they have no function. The phone terminal, or phone jack, 14 is connected at one side to the plate terminal of the last bulb socket in the original unit. The line connecting them is divided into two parts 15 and 16. The lines 15 and 16 are normally connected by a jack 17 which completes the circuit for the original unit.

When it is desired to connect the independent or additional unit, the terminals 4 are plugged into their corresponding sockets 13. The jack 17 is opened when the unit is put into place, thus breaking the connection between the lines 15 and 16. The jack is opened by the primary terminal 4 which depresses the. spring-arm 18 of the jack 17. The terminal 4 not only breaks the connection between the lines 15 and 16, but also makes electrical contact with the spring-arm 18 to throw the additional unit properly into the circuit.

The additional unit is preferably contained in the cabinet of the original unit and may be supported by guides 19 which hold it in place and insure that the terminals 4 will be plugged into the proper sockets 13.

If it is desired to operate without the independent unit, it is simply pulled out of place. This breaks the connection through the sockets 13 and reestablishes the circuit across the lines 15 and 16, since the jack 17 automatically closes when the terminal 49 is removed.

It .will be apparent that by providing properly connected auxiliary terminals, any number of units may be added to an original set without disturbing the exterior connections in any way. In this manner the amateur may easily add low priced units to his original set at any time he chooses in order to attain a more powerful receiving set. Any desired number of units may be utilized in the complete set, in order to get the best reception from both near and far sending stations.

The set will be entirely self-contained and will function as a complete set without any bothersome and unsightly connections and without a multiplicity of separate cabinets.

lVhile I have illustrated and described one embodiment of my invention, it will be understood that I am not limited to the embodiment herein described, but may make changes in the apparatus and mode of operation within the scope of the following claims.

I claim 1. A wireless receiving set including a cabinet containing a detecting unit, guides formed within the cabinet, a panel having an additional receiving unit mounted thereon and adapted to slide in the guides, cooperating contacts on the panel and within the cabinet for making suitable connection between the units, one of said contacts comprising a pair of terminals in the cabinet normally touch ing one another, and a post on the panel adapted to engage and make contact with one of said terminals and to separate the same from the other terminal, substantially as described. r

2. A wireless receiving set including a cabinet containing a detecting unit, guides formed wthin the cabinet, a plurality of terminals in line with the guides, a panel having an additional receiving unit mount ed thereon and adapted to slide in the guides the panel unit having terminals on the lower edge of the panel adapted to cooperate with the terminals in the cabinet, substantially as described.

In testimony whereof I have hereunto set my hand.

ILLIAM IQ THOMAS. 

